Theres a bunch of fish you could do. Clownfish, gobies, blennies, basslets, wrasses ect. It depends on what you like. I have two clowns, two firefish, and a tail spot blenny in my 29g. What coral you get depends on how aggressive they are, how strong your lights are, and if your fish or inverts are reef safe. I have peppermint shrimp in my tank because they are cheap, easy, and eat aiptaisia. But cleaner shrimp, or fire shrimp are cool to. (and theres more than that).